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Mesoscale Eddy Transport Across the Antarctic Circumpolar Current

其他書名	A Model-observation Comparison
出版	McGill University Libraries, 2020
URL	http://books.google.com.hk/books?id=nx72zQEACAAJ&hl=&source=gbs_api

註釋"As part of the Meridional Overturning Circulation, deep waters cross the strong fronts of the Antarctic Circumpolar Current (ACC) to upwell near the Antarctic coast, where they take up large amounts of excess heat and anthropogenic carbon from the atmo- sphere. Until recently, studies quantifying cross-frontal transport in the Southern Ocean have been mostly carried out with numerical models as observational data were too sparse in this region. Modelling studies have shown that mesoscale eddies are the main agents for the southward mass transport across the fronts of the ACC above major topographic sills. Recently, the number of measurements collected by the Argo array of profiling floats has become sufficient to allow reconstruction of eddy transport across the ACC. This study examines the transport of mass across the Polar Front, calculated between the surface and around 2 km depth from control simulations of a suite of climate models differing solely in the resolution of the ocean component (10, 0.250, 0.10). These transports are compared to transport estimates from Argo float measurements. All models underesti- mate the eddy transport across the Polar Front, relative to the observation-based results by at least 50 %. The mesoscale eddy transport parameterization used in the 10 model is found to compensate for the weak resolved eddy transport so that the magnitude of the resulting eddy transport is the closest to that from observational estimates across the model suite. In all models, eddy transport is amplified at regions associated with sharp topography in agreement with observations. The 0.10 and 0.250 models exclusively produce transport at topographic features whereas the 10 model also simulates significant eddy transport in between those features in agreement with observations. The 10 model is found to be the most realistic model within the suite in terms of magnitude and zonal pattern"--